4602e5f401
* scripttempl/elfppc.sc: Correct .rela.sdata entries. * scripttempl/elfppc.sc: Put the PLT between the small and large BSS segments. * emulparams/elf32ppc.sh (TEXT_START_ADDR): The ABI says `A program base of 0x02000000 is recommended...' because otherwise shared libraries are less efficient. We use 0x01800000 because otherwise it's impossible to branch to location 0, for instance if you have an undefined weak symbol.
215 lines
7.9 KiB
Scala
215 lines
7.9 KiB
Scala
#
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# Unusual variables checked by this code:
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# NOP - two byte opcode for no-op (defaults to 0)
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# DATA_ADDR - if end-of-text-plus-one-page isn't right for data start
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# OTHER_READONLY_SECTIONS - other than .text .init .rodata ...
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# (e.g., .PARISC.milli)
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# OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ...
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# (e.g., .PARISC.global)
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# OTHER_SECTIONS - at the end
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# EXECUTABLE_SYMBOLS - symbols that must be defined for an
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# executable (e.g., _DYNAMIC_LINK)
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# TEXT_START_SYMBOLS - symbols that appear at the start of the
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# .text section.
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# DATA_START_SYMBOLS - symbols that appear at the start of the
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# .data section.
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# OTHER_BSS_SYMBOLS - symbols that appear at the start of the
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# .bss section besides __bss_start.
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#
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# When adding sections, do note that the names of some sections are used
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# when specifying the start address of the next.
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#
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test -z "$ENTRY" && ENTRY=_start
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test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
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test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
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test "$LD_FLAG" = "N" && DATA_ADDR=.
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SBSS2=".sbss2 ${RELOCATING-0} : { *(.sbss2) }"
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SDATA2=".sdata2 ${RELOCATING-0} : { *(.sdata2) }"
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INTERP=".interp ${RELOCATING-0} : { *(.interp) }"
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PLT=".plt ${RELOCATING-0} : { *(.plt) }"
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cat <<EOF
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OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
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"${LITTLE_OUTPUT_FORMAT}")
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OUTPUT_ARCH(${ARCH})
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ENTRY(${ENTRY})
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${RELOCATING+${LIB_SEARCH_DIRS}}
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${RELOCATING+/* Do we need any of these for elf?
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__DYNAMIC = 0; ${STACKZERO+${STACKZERO}} ${SHLIB_PATH+${SHLIB_PATH}} */}
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${RELOCATING+${EXECUTABLE_SYMBOLS}}
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${RELOCATING- /* For some reason, the Solaris linker makes bad executables
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if gld -r is used and the intermediate file has sections starting
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at non-zero addresses. Could be a Solaris ld bug, could be a GNU ld
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bug. But for now assigning the zero vmas works. */}
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${RELOCATING+PROVIDE (__stack = 0);}
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SECTIONS
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{
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/* Read-only sections, merged into text segment: */
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${CREATE_SHLIB-${RELOCATING+. = ${TEXT_START_ADDR} + SIZEOF_HEADERS;}}
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${CREATE_SHLIB+${RELOCATING+. = SIZEOF_HEADERS;}}
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${CREATE_SHLIB-${INTERP}}
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.hash ${RELOCATING-0} : { *(.hash) }
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.dynsym ${RELOCATING-0} : { *(.dynsym) }
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.dynstr ${RELOCATING-0} : { *(.dynstr) }
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.gnu.version ${RELOCATING-0} : { *(.gnu.version) }
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.gnu.version_d ${RELOCATING-0} : { *(.gnu.version_d) }
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.gnu.version_r ${RELOCATING-0} : { *(.gnu.version_r) }
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.rela.text ${RELOCATING-0} :
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{ *(.rela.text) *(.rela.gnu.linkonce.t*) }
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.rela.data ${RELOCATING-0} :
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{ *(.rela.data) *(.rela.gnu.linkonce.d*) }
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.rela.rodata ${RELOCATING-0} :
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{ *(.rela.rodata) *(.rela.gnu.linkonce.r*) }
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.rela.got ${RELOCATING-0} : { *(.rela.got) }
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.rela.got1 ${RELOCATING-0} : { *(.rela.got1) }
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.rela.got2 ${RELOCATING-0} : { *(.rela.got2) }
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.rela.ctors ${RELOCATING-0} : { *(.rela.ctors) }
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.rela.dtors ${RELOCATING-0} : { *(.rela.dtors) }
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.rela.init ${RELOCATING-0} : { *(.rela.init) }
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.rela.fini ${RELOCATING-0} : { *(.rela.fini) }
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.rela.bss ${RELOCATING-0} : { *(.rela.bss) }
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.rela.plt ${RELOCATING-0} : { *(.rela.plt) }
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.rela.sdata ${RELOCATING-0} : { *(.rela.sdata) }
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.rela.sbss ${RELOCATING-0} : { *(.rela.sbss) }
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.rela.sdata2 ${RELOCATING-0} : { *(.rela.sdata2) }
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.rela.sbss2 ${RELOCATING-0} : { *(.rela.sbss2) }
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.text ${RELOCATING-0} :
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{
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${RELOCATING+${TEXT_START_SYMBOLS}}
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*(.text)
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/* .gnu.warning sections are handled specially by elf32.em. */
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*(.gnu.warning)
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*(.gnu.linkonce.t*)
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} =${NOP-0}
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.init ${RELOCATING-0} : { *(.init) } =${NOP-0}
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.fini ${RELOCATING-0} : { *(.fini) } =${NOP-0}
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.rodata ${RELOCATING-0} : { *(.rodata) *(.gnu.linkonce.r*) }
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.rodata1 ${RELOCATING-0} : { *(.rodata1) }
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${RELOCATING+_etext = .;}
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${RELOCATING+PROVIDE (etext = .);}
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${CREATE_SHLIB-${SDATA2}}
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${CREATE_SHLIB-${SBSS2}}
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${RELOCATING+${OTHER_READONLY_SECTIONS}}
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/* Adjust the address for the data segment. We want to adjust up to
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the same address within the page on the next page up. It would
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be more correct to do this:
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${RELOCATING+. = ${DATA_ADDR-ALIGN(${MAXPAGESIZE}) + (ALIGN(8) & (${MAXPAGESIZE} - 1))};}
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The current expression does not correctly handle the case of a
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text segment ending precisely at the end of a page; it causes the
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data segment to skip a page. The above expression does not have
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this problem, but it will currently (2/95) cause BFD to allocate
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a single segment, combining both text and data, for this case.
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This will prevent the text segment from being shared among
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multiple executions of the program; I think that is more
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important than losing a page of the virtual address space (note
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that no actual memory is lost; the page which is skipped can not
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be referenced). */
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${RELOCATING+. = ${DATA_ADDR- ALIGN(8) + ${MAXPAGESIZE}};}
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.data ${RELOCATING-0} :
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{
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${RELOCATING+${DATA_START_SYMBOLS}}
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*(.data)
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*(.gnu.linkonce.d*)
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${CONSTRUCTING+CONSTRUCTORS}
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}
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.data1 ${RELOCATING-0} : { *(.data1) }
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${RELOCATING+${OTHER_READWRITE_SECTIONS}}
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.got1 ${RELOCATING-0} : { *(.got1) }
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.dynamic ${RELOCATING-0} : { *(.dynamic) }
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/* Put .ctors and .dtors next to the .got2 section, so that the pointers
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get relocated with -mrelocatable. Also put in the .fixup pointers.
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The current compiler no longer needs this, but keep it around for 2.7.2 */
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${RELOCATING+PROVIDE (_GOT2_START_ = .);}
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.got2 ${RELOCATING-0} : { *(.got2) }
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${RELOCATING+PROVIDE (__CTOR_LIST__ = .);}
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.ctors ${RELOCATING-0} : { *(.ctors) }
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${RELOCATING+PROVIDE (__CTOR_END__ = .);}
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${RELOCATING+PROVIDE (__DTOR_LIST__ = .);}
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.dtors ${RELOCATING-0} : { *(.dtors) }
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${RELOCATING+PROVIDE (__DTOR_END__ = .);}
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${RELOCATING+PROVIDE (_FIXUP_START_ = .);}
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.fixup ${RELOCATING-0} : { *(.fixup) }
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${RELOCATING+PROVIDE (_FIXUP_END_ = .);}
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${RELOCATING+PROVIDE (_GOT2_END_ = .);}
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${RELOCATING+PROVIDE (_GOT_START_ = .);}
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.got ${RELOCATING-0} : { *(.got) }
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.got.plt ${RELOCATING-0} : { *(.got.plt) }
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${CREATE_SHLIB+${SDATA2}}
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${CREATE_SHLIB+${SBSS2}}
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${RELOCATING+PROVIDE (_GOT_END_ = .);}
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/* We want the small data sections together, so single-instruction offsets
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can access them all, and initialized data all before uninitialized, so
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we can shorten the on-disk segment size. */
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.sdata ${RELOCATING-0} : { *(.sdata) }
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${RELOCATING+_edata = .;}
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${RELOCATING+PROVIDE (edata = .);}
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.sbss ${RELOCATING-0} :
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{
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${RELOCATING+PROVIDE (__sbss_start = .);}
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*(.sbss)
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*(.scommon)
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${RELOCATING+PROVIDE (__sbss_end = .);}
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}
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${PLT}
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.bss ${RELOCATING-0} :
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{
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${RELOCATING+${OTHER_BSS_SYMBOLS}}
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${RELOCATING+PROVIDE (__bss_start = .);}
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*(.dynbss)
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*(.bss)
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*(COMMON)
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}
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${RELOCATING+_end = . ;}
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${RELOCATING+PROVIDE (end = .);}
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/* These are needed for ELF backends which have not yet been
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converted to the new style linker. */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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/* DWARF debug sections.
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Symbols in the DWARF debugging sections are relative to the beginning
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of the section so we begin them at 0. */
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/* DWARF 1 */
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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/* GNU DWARF 1 extensions */
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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/* DWARF 1.1 and DWARF 2 */
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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/* DWARF 2 */
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.debug_info 0 : { *(.debug_info) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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/* SGI/MIPS DWARF 2 extensions */
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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/* These must appear regardless of ${RELOCATING}. */
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${OTHER_SECTIONS}
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}
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EOF
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